After all the RSVP cards were returned, you meticulously created a seating chart for dinner, scrutinizing table placement in the room and stewing over which personalities would mesh the best. But despite all your attempts to perfectly pre-plan, one of your guests arrives with an uninvited plus-one and throws off the seating arrangement.

While you may want to immediately let him or her know how rude and inconsiderate it is to bring a guest who wasn't invited, resist the urge to react. Save your energy and let someone else handle the upset. Whether it be the wedding planner, day-of coordinator or your mother, let that person sweet-talk the caterer into whip up one extra dish. See if you can't just squeeze in the extra seat alongside the invited guest so that other tables aren't disrupted. It may seem a little tight, but honestly, no one's really going to notice 11 chairs at a round table for 10. And if you have to shift around another couple to make room at a table, it's not the worst thing that could go wrong at a wedding.

Today is not the day to teach your friend a life lesson in being a proper wedding guest. Plus, the uninvited date may not realize he or she is a surprise attendee, and you don't want to make that person feel unwelcome. Let it go and rest easy knowing you're the one exhibiting grace and class, which is exactly how a bride should behave.